/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/

/*
 *  FIPS-180-2 compliant SHA-384/512 implementation
 *
 *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *  This file is part of mbed TLS (https://tls.mbed.org)
 */
/*
 *  The SHA-512 Secure Hash Standard was published by NIST in 2002.
 *
 *  http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
 */

#include "tls/config.h"

#if defined(MBEDTLS_SHA512_C)

#include "tls/sha512.h"

#if defined(_MSC_VER) || defined(__WATCOMC__)
#define UL64(x) x##ui64
#else
#define UL64(x) x##ULL
#endif

#include <string.h>

#if defined(MBEDTLS_SELF_TEST)
#if defined(MBEDTLS_PLATFORM_C)
#include "tls/platform.h"
#else
#include <stdio.h>
#include <stdlib.h>
#define mbedtls_printf printf
#define mbedtls_calloc    calloc
#define mbedtls_free       free
#endif							/* MBEDTLS_PLATFORM_C */
#endif							/* MBEDTLS_SELF_TEST */

#if !defined(MBEDTLS_SHA512_ALT)

/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize(void *v, size_t n)
{
	volatile unsigned char *p = v;
	while (n--) {
		*p++ = 0;
	}
}

/*
 * 64-bit integer manipulation macros (big endian)
 */
#ifndef GET_UINT64_BE
#define GET_UINT64_BE(n, b, i)                            \
{                                                       \
	(n) = ((uint64_t)(b)[(i)] << 56)       \
		| ((uint64_t)(b)[(i) + 1] << 48)       \
		| ((uint64_t)(b)[(i) + 2] << 40)       \
		| ((uint64_t)(b)[(i) + 3] << 32)       \
		| ((uint64_t)(b)[(i) + 4] << 24)       \
		| ((uint64_t)(b)[(i) + 5] << 16)       \
		| ((uint64_t)(b)[(i) + 6] <<  8)       \
		| ((uint64_t)(b)[(i) + 7]);      \
}
#endif							/* GET_UINT64_BE */

#ifndef PUT_UINT64_BE
#define PUT_UINT64_BE(n, b, i)                            \
{                                                       \
	(b)[(i)] = (unsigned char)((n) >> 56);       \
	(b)[(i) + 1] = (unsigned char)((n) >> 48);       \
	(b)[(i) + 2] = (unsigned char)((n) >> 40);       \
	(b)[(i) + 3] = (unsigned char)((n) >> 32);       \
	(b)[(i) + 4] = (unsigned char)((n) >> 24);       \
	(b)[(i) + 5] = (unsigned char)((n) >> 16);       \
	(b)[(i) + 6] = (unsigned char)((n) >>  8);       \
	(b)[(i) + 7] = (unsigned char)((n));       \
}
#endif							/* PUT_UINT64_BE */

void mbedtls_sha512_init(mbedtls_sha512_context *ctx)
{
	memset(ctx, 0, sizeof(mbedtls_sha512_context));
}

void mbedtls_sha512_free(mbedtls_sha512_context *ctx)
{
	if (ctx == NULL) {
		return;
	}

	mbedtls_zeroize(ctx, sizeof(mbedtls_sha512_context));
}

void mbedtls_sha512_clone(mbedtls_sha512_context *dst, const mbedtls_sha512_context *src)
{
	*dst = *src;
}

/*
 * SHA-512 context setup
 */
void mbedtls_sha512_starts(mbedtls_sha512_context *ctx, int is384)
{
	ctx->total[0] = 0;
	ctx->total[1] = 0;

	if (is384 == 0) {
		/* SHA-512 */
		ctx->state[0] = UL64(0x6A09E667F3BCC908);
		ctx->state[1] = UL64(0xBB67AE8584CAA73B);
		ctx->state[2] = UL64(0x3C6EF372FE94F82B);
		ctx->state[3] = UL64(0xA54FF53A5F1D36F1);
		ctx->state[4] = UL64(0x510E527FADE682D1);
		ctx->state[5] = UL64(0x9B05688C2B3E6C1F);
		ctx->state[6] = UL64(0x1F83D9ABFB41BD6B);
		ctx->state[7] = UL64(0x5BE0CD19137E2179);
	} else {
		/* SHA-384 */
		ctx->state[0] = UL64(0xCBBB9D5DC1059ED8);
		ctx->state[1] = UL64(0x629A292A367CD507);
		ctx->state[2] = UL64(0x9159015A3070DD17);
		ctx->state[3] = UL64(0x152FECD8F70E5939);
		ctx->state[4] = UL64(0x67332667FFC00B31);
		ctx->state[5] = UL64(0x8EB44A8768581511);
		ctx->state[6] = UL64(0xDB0C2E0D64F98FA7);
		ctx->state[7] = UL64(0x47B5481DBEFA4FA4);
	}

	ctx->is384 = is384;
}

#if !defined(MBEDTLS_SHA512_PROCESS_ALT)

/*
 * Round constants
 */
static const uint64_t K[80] = {
	UL64(0x428A2F98D728AE22), UL64(0x7137449123EF65CD),
	UL64(0xB5C0FBCFEC4D3B2F), UL64(0xE9B5DBA58189DBBC),
	UL64(0x3956C25BF348B538), UL64(0x59F111F1B605D019),
	UL64(0x923F82A4AF194F9B), UL64(0xAB1C5ED5DA6D8118),
	UL64(0xD807AA98A3030242), UL64(0x12835B0145706FBE),
	UL64(0x243185BE4EE4B28C), UL64(0x550C7DC3D5FFB4E2),
	UL64(0x72BE5D74F27B896F), UL64(0x80DEB1FE3B1696B1),
	UL64(0x9BDC06A725C71235), UL64(0xC19BF174CF692694),
	UL64(0xE49B69C19EF14AD2), UL64(0xEFBE4786384F25E3),
	UL64(0x0FC19DC68B8CD5B5), UL64(0x240CA1CC77AC9C65),
	UL64(0x2DE92C6F592B0275), UL64(0x4A7484AA6EA6E483),
	UL64(0x5CB0A9DCBD41FBD4), UL64(0x76F988DA831153B5),
	UL64(0x983E5152EE66DFAB), UL64(0xA831C66D2DB43210),
	UL64(0xB00327C898FB213F), UL64(0xBF597FC7BEEF0EE4),
	UL64(0xC6E00BF33DA88FC2), UL64(0xD5A79147930AA725),
	UL64(0x06CA6351E003826F), UL64(0x142929670A0E6E70),
	UL64(0x27B70A8546D22FFC), UL64(0x2E1B21385C26C926),
	UL64(0x4D2C6DFC5AC42AED), UL64(0x53380D139D95B3DF),
	UL64(0x650A73548BAF63DE), UL64(0x766A0ABB3C77B2A8),
	UL64(0x81C2C92E47EDAEE6), UL64(0x92722C851482353B),
	UL64(0xA2BFE8A14CF10364), UL64(0xA81A664BBC423001),
	UL64(0xC24B8B70D0F89791), UL64(0xC76C51A30654BE30),
	UL64(0xD192E819D6EF5218), UL64(0xD69906245565A910),
	UL64(0xF40E35855771202A), UL64(0x106AA07032BBD1B8),
	UL64(0x19A4C116B8D2D0C8), UL64(0x1E376C085141AB53),
	UL64(0x2748774CDF8EEB99), UL64(0x34B0BCB5E19B48A8),
	UL64(0x391C0CB3C5C95A63), UL64(0x4ED8AA4AE3418ACB),
	UL64(0x5B9CCA4F7763E373), UL64(0x682E6FF3D6B2B8A3),
	UL64(0x748F82EE5DEFB2FC), UL64(0x78A5636F43172F60),
	UL64(0x84C87814A1F0AB72), UL64(0x8CC702081A6439EC),
	UL64(0x90BEFFFA23631E28), UL64(0xA4506CEBDE82BDE9),
	UL64(0xBEF9A3F7B2C67915), UL64(0xC67178F2E372532B),
	UL64(0xCA273ECEEA26619C), UL64(0xD186B8C721C0C207),
	UL64(0xEADA7DD6CDE0EB1E), UL64(0xF57D4F7FEE6ED178),
	UL64(0x06F067AA72176FBA), UL64(0x0A637DC5A2C898A6),
	UL64(0x113F9804BEF90DAE), UL64(0x1B710B35131C471B),
	UL64(0x28DB77F523047D84), UL64(0x32CAAB7B40C72493),
	UL64(0x3C9EBE0A15C9BEBC), UL64(0x431D67C49C100D4C),
	UL64(0x4CC5D4BECB3E42B6), UL64(0x597F299CFC657E2A),
	UL64(0x5FCB6FAB3AD6FAEC), UL64(0x6C44198C4A475817)
};

void mbedtls_sha512_process(mbedtls_sha512_context *ctx, const unsigned char data[128])
{
	int i;
	uint64_t temp1, temp2, W[80];
	uint64_t A, B, C, D, E, F, G, H;

#define  SHR(x, n) (x >> n)
#define ROTR(x, n) (SHR(x, n) | (x << (64 - n)))

#define S0(x) (ROTR(x, 1) ^ ROTR(x, 8) ^  SHR(x, 7))
#define S1(x) (ROTR(x, 19) ^ ROTR(x, 61) ^  SHR(x, 6))

#define S2(x) (ROTR(x, 28) ^ ROTR(x, 34) ^ ROTR(x, 39))
#define S3(x) (ROTR(x, 14) ^ ROTR(x, 18) ^ ROTR(x, 41))

#define F0(x, y, z) ((x & y) | (z & (x | y)))
#define F1(x, y, z) (z ^ (x & (y ^ z)))

#define P(a, b, c, d, e, f, g, h, x, K)                  \
{                                               \
	temp1 = h + S3(e) + F1(e, f, g) + K + x;      \
	temp2 = S2(a) + F0(a, b, c);                  \
	d += temp1; h = temp1 + temp2;              \
}

	for (i = 0; i < 16; i++) {
		GET_UINT64_BE(W[i], data, i << 3);
	}

	for (; i < 80; i++) {
		W[i] = S1(W[i - 2]) + W[i - 7] + S0(W[i - 15]) + W[i - 16];
	}

	A = ctx->state[0];
	B = ctx->state[1];
	C = ctx->state[2];
	D = ctx->state[3];
	E = ctx->state[4];
	F = ctx->state[5];
	G = ctx->state[6];
	H = ctx->state[7];
	i = 0;

	do {
		P(A, B, C, D, E, F, G, H, W[i], K[i]);
		i++;
		P(H, A, B, C, D, E, F, G, W[i], K[i]);
		i++;
		P(G, H, A, B, C, D, E, F, W[i], K[i]);
		i++;
		P(F, G, H, A, B, C, D, E, W[i], K[i]);
		i++;
		P(E, F, G, H, A, B, C, D, W[i], K[i]);
		i++;
		P(D, E, F, G, H, A, B, C, W[i], K[i]);
		i++;
		P(C, D, E, F, G, H, A, B, W[i], K[i]);
		i++;
		P(B, C, D, E, F, G, H, A, W[i], K[i]);
		i++;
	} while (i < 80);

	ctx->state[0] += A;
	ctx->state[1] += B;
	ctx->state[2] += C;
	ctx->state[3] += D;
	ctx->state[4] += E;
	ctx->state[5] += F;
	ctx->state[6] += G;
	ctx->state[7] += H;
}
#endif							/* !MBEDTLS_SHA512_PROCESS_ALT */

/*
 * SHA-512 process buffer
 */
void mbedtls_sha512_update(mbedtls_sha512_context *ctx, const unsigned char *input, size_t ilen)
{
	size_t fill;
	unsigned int left;

	if (ilen == 0) {
		return;
	}

	left = (unsigned int)(ctx->total[0] & 0x7F);
	fill = 128 - left;

	ctx->total[0] += (uint64_t)ilen;

	if (ctx->total[0] < (uint64_t)ilen) {
		ctx->total[1]++;
	}

	if (left && ilen >= fill) {
		memcpy((void *)(ctx->buffer + left), input, fill);
		mbedtls_sha512_process(ctx, ctx->buffer);
		input += fill;
		ilen -= fill;
		left = 0;
	}

	while (ilen >= 128) {
		mbedtls_sha512_process(ctx, input);
		input += 128;
		ilen -= 128;
	}

	if (ilen > 0) {
		memcpy((void *)(ctx->buffer + left), input, ilen);
	}
}

static const unsigned char sha512_padding[128] = {
	0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};

/*
 * SHA-512 final digest
 */
void mbedtls_sha512_finish(mbedtls_sha512_context *ctx, unsigned char output[64])
{
	size_t last, padn;
	uint64_t high, low;
	unsigned char msglen[16];

	high = (ctx->total[0] >> 61)
		   | (ctx->total[1] << 3);
	low = (ctx->total[0] << 3);

	PUT_UINT64_BE(high, msglen, 0);
	PUT_UINT64_BE(low, msglen, 8);

	last = (size_t)(ctx->total[0] & 0x7F);
	padn = (last < 112) ? (112 - last) : (240 - last);

	mbedtls_sha512_update(ctx, sha512_padding, padn);
	mbedtls_sha512_update(ctx, msglen, 16);

	PUT_UINT64_BE(ctx->state[0], output, 0);
	PUT_UINT64_BE(ctx->state[1], output, 8);
	PUT_UINT64_BE(ctx->state[2], output, 16);
	PUT_UINT64_BE(ctx->state[3], output, 24);
	PUT_UINT64_BE(ctx->state[4], output, 32);
	PUT_UINT64_BE(ctx->state[5], output, 40);

	if (ctx->is384 == 0) {
		PUT_UINT64_BE(ctx->state[6], output, 48);
		PUT_UINT64_BE(ctx->state[7], output, 56);
	}
}

#endif							/* !MBEDTLS_SHA512_ALT */

/*
 * output = SHA-512( input buffer )
 */
void mbedtls_sha512(const unsigned char *input, size_t ilen, unsigned char output[64], int is384)
{
	mbedtls_sha512_context ctx;

	mbedtls_sha512_init(&ctx);
	mbedtls_sha512_starts(&ctx, is384);
	mbedtls_sha512_update(&ctx, input, ilen);
	mbedtls_sha512_finish(&ctx, output);
	mbedtls_sha512_free(&ctx);
}

#if defined(MBEDTLS_SELF_TEST)

/*
 * FIPS-180-2 test vectors
 */
static const unsigned char sha512_test_buf[3][113] = {
	{"abc"},
	{"abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn" "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu"},
	{""}
};

static const int sha512_test_buflen[3] = {
	3, 112, 1000
};

static const unsigned char sha512_test_sum[6][64] = {
	/*
	 * SHA-384 test vectors
	 */
	{
		0xCB, 0x00, 0x75, 0x3F, 0x45, 0xA3, 0x5E, 0x8B,
		0xB5, 0xA0, 0x3D, 0x69, 0x9A, 0xC6, 0x50, 0x07,
		0x27, 0x2C, 0x32, 0xAB, 0x0E, 0xDE, 0xD1, 0x63,
		0x1A, 0x8B, 0x60, 0x5A, 0x43, 0xFF, 0x5B, 0xED,
		0x80, 0x86, 0x07, 0x2B, 0xA1, 0xE7, 0xCC, 0x23,
		0x58, 0xBA, 0xEC, 0xA1, 0x34, 0xC8, 0x25, 0xA7
	},
	{
		0x09, 0x33, 0x0C, 0x33, 0xF7, 0x11, 0x47, 0xE8,
		0x3D, 0x19, 0x2F, 0xC7, 0x82, 0xCD, 0x1B, 0x47,
		0x53, 0x11, 0x1B, 0x17, 0x3B, 0x3B, 0x05, 0xD2,
		0x2F, 0xA0, 0x80, 0x86, 0xE3, 0xB0, 0xF7, 0x12,
		0xFC, 0xC7, 0xC7, 0x1A, 0x55, 0x7E, 0x2D, 0xB9,
		0x66, 0xC3, 0xE9, 0xFA, 0x91, 0x74, 0x60, 0x39
	},
	{
		0x9D, 0x0E, 0x18, 0x09, 0x71, 0x64, 0x74, 0xCB,
		0x08, 0x6E, 0x83, 0x4E, 0x31, 0x0A, 0x4A, 0x1C,
		0xED, 0x14, 0x9E, 0x9C, 0x00, 0xF2, 0x48, 0x52,
		0x79, 0x72, 0xCE, 0xC5, 0x70, 0x4C, 0x2A, 0x5B,
		0x07, 0xB8, 0xB3, 0xDC, 0x38, 0xEC, 0xC4, 0xEB,
		0xAE, 0x97, 0xDD, 0xD8, 0x7F, 0x3D, 0x89, 0x85
	},

	/*
	 * SHA-512 test vectors
	 */
	{
		0xDD, 0xAF, 0x35, 0xA1, 0x93, 0x61, 0x7A, 0xBA,
		0xCC, 0x41, 0x73, 0x49, 0xAE, 0x20, 0x41, 0x31,
		0x12, 0xE6, 0xFA, 0x4E, 0x89, 0xA9, 0x7E, 0xA2,
		0x0A, 0x9E, 0xEE, 0xE6, 0x4B, 0x55, 0xD3, 0x9A,
		0x21, 0x92, 0x99, 0x2A, 0x27, 0x4F, 0xC1, 0xA8,
		0x36, 0xBA, 0x3C, 0x23, 0xA3, 0xFE, 0xEB, 0xBD,
		0x45, 0x4D, 0x44, 0x23, 0x64, 0x3C, 0xE8, 0x0E,
		0x2A, 0x9A, 0xC9, 0x4F, 0xA5, 0x4C, 0xA4, 0x9F
	},
	{
		0x8E, 0x95, 0x9B, 0x75, 0xDA, 0xE3, 0x13, 0xDA,
		0x8C, 0xF4, 0xF7, 0x28, 0x14, 0xFC, 0x14, 0x3F,
		0x8F, 0x77, 0x79, 0xC6, 0xEB, 0x9F, 0x7F, 0xA1,
		0x72, 0x99, 0xAE, 0xAD, 0xB6, 0x88, 0x90, 0x18,
		0x50, 0x1D, 0x28, 0x9E, 0x49, 0x00, 0xF7, 0xE4,
		0x33, 0x1B, 0x99, 0xDE, 0xC4, 0xB5, 0x43, 0x3A,
		0xC7, 0xD3, 0x29, 0xEE, 0xB6, 0xDD, 0x26, 0x54,
		0x5E, 0x96, 0xE5, 0x5B, 0x87, 0x4B, 0xE9, 0x09
	},
	{
		0xE7, 0x18, 0x48, 0x3D, 0x0C, 0xE7, 0x69, 0x64,
		0x4E, 0x2E, 0x42, 0xC7, 0xBC, 0x15, 0xB4, 0x63,
		0x8E, 0x1F, 0x98, 0xB1, 0x3B, 0x20, 0x44, 0x28,
		0x56, 0x32, 0xA8, 0x03, 0xAF, 0xA9, 0x73, 0xEB,
		0xDE, 0x0F, 0xF2, 0x44, 0x87, 0x7E, 0xA6, 0x0A,
		0x4C, 0xB0, 0x43, 0x2C, 0xE5, 0x77, 0xC3, 0x1B,
		0xEB, 0x00, 0x9C, 0x5C, 0x2C, 0x49, 0xAA, 0x2E,
		0x4E, 0xAD, 0xB2, 0x17, 0xAD, 0x8C, 0xC0, 0x9B
	}
};

/*
 * Checkup routine
 */
int mbedtls_sha512_self_test(int verbose)
{
	int i, j, k, buflen, ret = 0;
	unsigned char *buf;
	unsigned char sha512sum[64];
	mbedtls_sha512_context ctx;

	buf = mbedtls_calloc(1024, sizeof(unsigned char));
	if (NULL == buf) {
		if (verbose != 0) {
			mbedtls_printf("Buffer allocation failed\n");
		}

		return (1);
	}

	mbedtls_sha512_init(&ctx);

	for (i = 0; i < 6; i++) {
		j = i % 3;
		k = i < 3;

		if (verbose != 0) {
			mbedtls_printf("  SHA-%d test #%d: ", 512 - k * 128, j + 1);
		}

		mbedtls_sha512_starts(&ctx, k);

		if (j == 2) {
			memset(buf, 'a', buflen = 1000);

			for (j = 0; j < 1000; j++) {
				mbedtls_sha512_update(&ctx, buf, buflen);
			}
		} else {
			mbedtls_sha512_update(&ctx, sha512_test_buf[j], sha512_test_buflen[j]);
		}

		mbedtls_sha512_finish(&ctx, sha512sum);

		if (memcmp(sha512sum, sha512_test_sum[i], 64 - k * 16) != 0) {
			if (verbose != 0) {
				mbedtls_printf("failed\n");
			}

			ret = 1;
			goto exit;
		}

		if (verbose != 0) {
			mbedtls_printf("passed\n");
		}
	}

	if (verbose != 0) {
		mbedtls_printf("\n");
	}

exit:
	mbedtls_sha512_free(&ctx);
	mbedtls_free(buf);

	return (ret);
}

#endif							/* MBEDTLS_SELF_TEST */

#endif							/* MBEDTLS_SHA512_C */
